C employed by B in their design office.
C not a member of Trade Union.
Trade Union officials told B that if claimant was not
dismissed the trade union would withdraw its labour.
B yielded and lawfully terminated claimant’s contract of
House of Lords held claimant entitled to succeed on ground
Held that such a tort exists and that it extends to
threats by A to break his contract with B, and is not confined to threats of
criminal or tortuous conduct.